:root {
    --primary: #2c3e50;
    --secondary: #34495e;
    --accent: #3498db;
    --danger: #e74c3c;
    --success: #27ae60;
    --bg-light: #ecf0f1;
    --border: #bdc3c7;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, sans-serif;
    display: flex;
    flex-direction: column;
    height: 100vh;
    background-color: var(--bg-light);
    color: var(--primary);
}

.toolbar {
    background-color: #ffffff;
    padding: 10px 15px;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    z-index: 10;
}

.separator {
    width: 1px;
    height: 20px;
    background-color: var(--border);
    margin: 0 4px;
}

button {
    padding: 6px 12px;
    cursor: pointer;
    background-color: var(--accent);
    color: #ffffff;
    border: none;
    border-radius: 4px;
    font-size: 10px;
    font-weight: 600;
    transition: background-color 0.2s;
}

button:hover {
    background-color: var(--accent);
}

button.active { 
    background-color: var(--danger); 
}

button.action { background-color: var(--success); }
button.action:hover { background-color: #219653; }

.workspace {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.canvas-container {
    flex: 1;
    background-color: #ffffff;
    margin: 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    position: relative;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    overflow: hidden;
    min-width: 300px;
    min-height: 200px;
}

.resizer-r {
    width: 8px;
    height: 100%;
    background: transparent;
    position: absolute;
    right: 0;
    top: 0;
    cursor: col-resize;
    z-index: 10;
}
.resizer-r:hover { background: rgba(52, 152, 219, 0.3); }

.resizer-b {
    height: 8px;
    width: 100%;
    background: transparent;
    position: absolute;
    bottom: 0;
    left: 0;
    cursor: row-resize;
    z-index: 10;
}
.resizer-b:hover { background: rgba(52, 152, 219, 0.3); }

canvas {
    display: block;
    width: 100%;
    height: 100%;
}

.sidebar {
    width: 400px;
    background-color: #ffffff;
    border-left: 1px solid var(--border);
    padding: 10px;
    overflow-y: auto;
}

details {
    margin-bottom: 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background-color: #fafafa;
    overflow: hidden;
}

summary {
    background-color: var(--secondary);
    color: #ffffff;
    padding: 10px;
    cursor: pointer;
    font-weight: 600;
    font-size: 13px;
    user-select: none;
}
summary:hover { background-color: var(--primary); }

.panel-content {
    padding: 12px;
    font-size: 12px;
    background-color: #fafafa;
}
.property-grid {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 10px;
}
.property-grid th, .property-grid td {
    border: 1px solid var(--border);
    padding: 6px 10px;
    text-align: left;
}
.property-grid th { background-color: #eef2f5; width: 40%; }
.property-grid input, .property-grid select {
    width: 100%;
    box-sizing: border-box;
    padding: 4px;
    border: 1px solid #ccc;
}
.matrix-container {
    width: 100%;
    overflow-x: auto;
    margin-top: 10px;
    background: #fff;
    border: 1px solid var(--border);
    max-height: 200px;
}
.matrix-table {
    border-collapse: collapse;
    width: 100%;
    font-size: 11px;
    text-align: center;
}
.matrix-table th, .matrix-table td {
    border: 1px solid var(--border);
    padding: 4px;
}
.matrix-table th { background-color: #eef2f5; }
.log-box {
    width: 100%;
    height: 100px;
    background: #222;
    color: #0f0;
    font-family: monospace;
    padding: 8px;
    box-sizing: border-box;
    overflow-y: auto;
    border-radius: 4px;
    margin-top: 10px;
    white-space: pre-wrap;
}

/* --- New Layout Classes --- */
.main-column {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow: hidden;
    margin: 10px;
}

/* Override existing canvas-container margin */
.main-column .canvas-container {
    margin: 0; 
}

.bottom-log {
    margin-top: 10px;
    margin-bottom: 0;
    flex-shrink: 0;
}

.bottom-log .log-box {
    height: 120px;
}

/* Canvas Overlay Controls */
.canvas-controls {
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 10;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.canvas-controls button {
    width: 32px;
    height: 32px;
    padding: 0;
    font-size: 16px;
    text-align: center;
    background-color: var(--secondary);
    opacity: 0.8;
}

.canvas-controls button:hover {
    opacity: 1;
}

.canvas-controls button#btnCenterView,
.canvas-controls button#btnModePan {
    width: auto;
    padding: 0 8px;
    font-size: 11px;
}

.canvas-controls button.active {
    background-color: var(--danger);
    opacity: 1;
}

/* --- New Log Animations --- */
@keyframes flashUpdate {
    0% { box-shadow: inset 0 0 0 0 transparent; }
    20% { box-shadow: inset 0 0 15px 2px #3498db; background-color: #1a3d5c; }
    100% { box-shadow: inset 0 0 0 0 transparent; background-color: #222; }
}


/* Animations for UI Feedback */
@keyframes flashError {
    0% { box-shadow: inset 0 0 0 0 transparent; }
    20% { box-shadow: inset 0 0 15px 2px var(--danger); background-color: #3d1a1a; }
    100% { box-shadow: inset 0 0 0 0 transparent; background-color: #222; }
}

@keyframes flashSelect {
    0% { background-color: #fafafa; }
    20% { background-color: #d6eaf8; box-shadow: inset 0 0 10px rgba(52, 152, 219, 0.3); }
    100% { background-color: #fafafa; }
}

.flash-error {
    animation: flashError 1.5s ease-out;
}

.flash-select {
    animation: flashSelect 0.8s ease-out;
}

.flash-update {
    animation: flashUpdate 1.0s ease-out;
}

/* --- Mobile & Tablet Responsive Layout --- */
@media (max-width: 768px) {
    .workspace {
        flex-direction: column;
        overflow-y: auto;
    }
    
    .main-column {
        height: 55vh; /* Reserve top half for canvas and log */
        min-height: 450px; /* Lock minimum absolute size to prevent address-bar collapse */
        display: flex;
        flex: none;
        margin: 5px;
    }
    
    .canvas-container {
        flex: 1; /* Forces canvas to stretch to fill the locked minimum height */
    }

    .sidebar {
        width: 100%;
        border-left: none;
        border-top: 1px solid var(--border);
        box-sizing: border-box;
        overflow-y: visible;
    }
    
    .toolbar {
        justify-content: center;
        padding: 5px;
    }
    
    .toolbar button {
        padding: 8px 10px; /* Larger tap targets */
        font-size: 11px;
    }
    
    .bottom-log .log-box {
        height: 80px; /* Compress log slightly on mobile */
    }
}


/* --- Tutorial Modal --- */
.tutorial-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.6);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}
.tutorial-modal {
    background: #ffffff;
    width: 450px;
    padding: 24px;
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}
.tutorial-modal h3 { 
    margin-top: 0; 
    color: var(--primary); 
    border-bottom: 2px solid var(--border);
    padding-bottom: 10px;
}
.tutorial-modal p { 
    font-size: 13px; 
    line-height: 1.6; 
    color: var(--secondary); 
    min-height: 70px;
}
.tutorial-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 20px;
    font-size: 12px;
    font-weight: bold;
    color: #7f8c8d;
}